Portable power tool, such as an angle grinder, has an anti-vibration ball type balancing unit, and an auxiliary balancer to counteract both static and dynamic vibration forces

摘要

The portable power tool has a rotating output shaft (13) journalled in two axially spaced bearings (15,16) and has at its forward end (13a) a working implement mounting device (19) and an anti-vibration ball type balancing unit (20). An auxiliary balancer (26) is provided at the rear end (13b) of the output shaft (13) for dynamic balancing of the rotating parts including working implement mounted on the output shaft (13) at operation of the power tool. The power transmission has an angle drive with a pinion (24) connected to a motor (11) and a bevel gear (25) on the output shaft (13) between the forward and rear bearings (15,16).